US1761867A - Push button - Google Patents

Description

June 3, 1930. B. BOBROFF 1,761,867

PUSH BUTTON Filed April 4, 1923 z sheets-sheet 1 MHH',

A T TORNE Y June 3, 1930. B. BoBRoFF 1,761,867

` PUSH BUTTON Filed April 4, 1928 2 Sheets-Sheet 2 w f? WM' n ATTORNEY*A Patented June 3, 1930 UNITED STATES BORNETT L. BOBROFF, OF MILVJAUKEE, WSCONSIN PUSH BUTTON Application. filed April a, 1928.

The invention relates to circuit-closers and more particularly to circuit-closers of the push-button type. f

An object of the invention is to provide a push-button for use in the indicator-con trolling circuits of a hospital signalling system, and ofy such construction that the actuation of the push-button will eifect the operation of switching means movable to successive switching positions and simultaneously d i s a b l e an indicating means connected in circuit with the switching means, and that the release of the push-button when the switching means reaches its desired switching position will eifect the operation of the indicating means.

Another object of the invention is to provide a push-button for this purpose including a spring-urged contact-establishing member alternatively engageable with different contacts, and of such character as to facilitate and simplify manufacture and assembly.

A further object is to provide a pushbutton including a plurality of stationary contacts assembled in insulated relation by co-operat-ing attaching members which also form separate terminals for the contacts.

A further object of the invention is to perfect details of construction generally.

rThe invention further consists in the several features hereinafter set forth and more particularly delined by the annexed claims.

ln the accompanying drawings, Fig. 1 is a longitudinal sectional view of a puslcbutton embodying the invention;

Fig. 2 is a similar view taken on the line 2 2 of Fig. 1;

Fig. B is an end view of the push-button of Fig. 1;

Fig. l is a transverse sectional view of the push-button of Fig. 1 taken on the line -a of Fig. 1;

Fig. 5 is a longitudinal sectional view of another form of push-button embodying thc invention Fig. 6 is a similar view taken on the line 6-6 of Fig. 5;

Fig. 7 is an en'd view of the push-button of Fig. 5;

Serial No. 257,454.

Fig. 8 is a transverse sectional view of the push-button of Fig. 5 taken on the line 8-8 of Fi 5;

Fig. 9 is a longitudinal sectional view of third form of push-button embodying the invention Fig. 1() is a similar view taken on the line 10-10 of Fig. 9;

Fig. 11 is an end view of the push-button of Fig. 9;

Fig. 12 is a transverse sectional view of the push-button of Fig. 9 taken on the line 12-12 of Fig. 9; and

Fig. 13 is a schematic wiring diagram of a signalling system including the push-button of this invention.

ln that embodiment of the invention shown in Fig. 1, the numeral 15 designates a cylindrical tubular metal casing, which is adapted to tit closely within a bore 16 formed axially through the pear-shaped end portion 17 of a push-button holder 18, which latter is illustrated in dotted outline in Fig. 13 and includes a flat iiidicating portion 19 containing a plurality of indicating lamps 20. The push-button holder 18 may be of the general type disclosed in United States Patent No. 1,367,583, issued to me on Febru ary 8, 1921. The cylindrical casing 15 is secured within the push-button holder 18 in any suitable manner, as by means of a tight lit in the bore 16, and is provided with a iiange 21 at its outer end engaging the end face of the holder.

An insulating member 22 has a generally circular portion 23 disposed within the inner end portion of the cylindrical casing 15 and is provided with a flanged end 24 which abuts against the inner end of the casing. The insulating member 22 is held in the casino' 15 in any suitable manner, as by means of several screws 25 passing through openings in the casing and threaded radially into the portion 23 of the insulating member. The insulating member 22 is provided with a liange '26 at its inner or lower end extending substantially diametrically of the insulating member, and a boss 27 is formed on the insulating member at one side of the fla-nge 26. The boss 27 has an arcuate exterior tting 1:00

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within the bore 16 in the push-button holder and is provided with longitudinallyeextending ley projections 23 which lit within lreyways 29 formed in the bore 1G to prevent relative rotation oll the insulating member and its attached casing l5 with respect to the push-button holder. The cylindrical portion ot the insulating member 22 within the casing l5 is slightly smaller in diameter than the interior of the l-sing and is surrounded by an insulating sleeve 30, which projects beyond the forward end oit the insulating member towards the outer end ot the casing. @ne side portion of the insulating member 22 within 'the casing l5 is ollset to provide a forwardly or upwardly projecting portion having a flat tace lying in a plane normal to the axis ot the casing, and a Jshaped notch 3l formed at an intermediate portion of this 'tace adjacent the inner side of the oitl'set portion, the oii'set portion being disposed on the opposite side of the axis ot' the insulating member :troni the boss 27. A pair of longitudinally-extending bores 32 are 'formed through the insulating member 22 on opposite sides of the notch 3l and terminate at their lower ends in channels 33 which open at the rearward or lower ends of the flange 2G and at the,` side ot the liange opposite the boss 7. Bolts 3% and 35 are placed in respective bores and have llat rectangular heads 3 l and 35 respectively, which tit witl in the channels 33 in the flange 2G and abut against the flanged portion 24 of the insulating member. The threaded upper or forward ends of the bolts 3e and 35 project beyond the forward or upper notched face of the insulating' member 22, and the bolt 35 is surrounded by a boss 36 formed on the lorward or upper end of the insulating member 22 A segmentally-shaped contact member 37 of llat resilient metal is apertured to receive the bolts 34e and 35 and is disposed against the upper or forward end of the insulating member within the casing, against which tace the contact member is held at one side by a nut 38 threaded on the bolt 3a and also forming an electrical connection between the bolt and contact meniber. Ait the other side of the insulating` member 22 the apertured contact member 37 tits about the boss 3G' to properly position the Contact member and to insulate it from the bolt 35.

A Ushaped insulating` member 39 of segmental contour has an arcuate exterior litting within the insulating` sleeve 30 and is apertured to receive therethrough the bolts 3e and 35, the lower or rearward lace of the insulating member 39 being provided with recesses l0 and Lll to receive and provide clearance for the nut 33 and boss 36.

A second segmentally-shaped contact meinber 42, which may be identical with the contact member 37, surmounts 'the insulating member 39 and is apertured to receive theretiirough the bolts 341 and 35. The contact member Ll2 is held against the insulating member 39 at one side by a nut i3 threaded onto t-he bolt 35, which nut also forms an electrical connection between the bolt 35 and the contact member 42. At the other side of the insulating member 39 the apertured contact member l2 lits about a boss ell on the insulating member to properly position the contact member and to insulate it from the bolt 34. A nut ll5 on the upper and forward end ot the bolt bears on an insulating washer 4G which engages the contact member 4:2 to clamp the contact member into position.

By means of the construction above described, the contact members 37 and l2 are accurately and conveniently assembled and firmly held in spaced relation within the casing l5, and are also connected in electrical contact with the bolts 3il and 35 respectively. A. terminal screw i7 is threaded laterally into the head of the bolt and another terminal screw d8 is threaded laterally into the head ot the bolt suitable clearance spaces being` left within the .flange 26 to receive the ends ot the screws.

A bore 1ll) is formed in the insulatingmember to extend in parallel relation to the axis and passes through the boss 2T. A meta-l bushing 50 is pressed into the bore llt) and terminates short olI the upper or forward end of the bore to form a shoulder 5l within the bore. A bore 52 is formed co-axially in the upper or vloiwvard portions ot the bushing 50, and a terminal screw 53 is threaded into the rearward or lower end of the bushing.

'lhe bore in the bushing 50 slidably receives therein the reduced cylindrical end portion 54T ot a plunger stem The major portion ot the plunger stem arranged in parallel relation to the axis ot the casing l5 a vd lies adjacent the wall ot the casing. The outer or Aiformird end ol the plunger stem 55 has a portion disposed at the axis ot the casing 15 and is provided with a reduced projection 5G which is riveted centrally of the bottom portion olf a shallow metal cup 57. A circula.v nitton 53, preferably oi' insulating material, is cemented or otherwise secured to the cup 57 and slidably lits within the outer end portion ot the cylindrical casing l5.

'llhe plunger stem 55 is provided with a laterally disposed projection oi diamondshaped cross-section extending into a channel or slot (SO 'lormed centrally through the insulating member 39 in a direction parallel to tbe axis of the casing l5. The contact members o7 and l2 :lose opposite ends of the channel t3() and each is provided with a slit til extending diainetrically with respect to Vthe casing l5, the slits in the contact inem- Y`ers being arranged to lie in the same plane.

A V-shaped groove is formed on the inner side of Ieach contact member along the slit 61 to provide V-shaped contact surfaces with which the opposite knife-edges of the diamond-shaped contact projection 59 are alternatively engageable. The slitting of the contact members provides a degree of resiliency adjacent the contact surfaces in order to insure good electrical contact with the ycontact projection 59 on the plunger stem.

A coiled spring 62 surrounds the reduced portion 54 of the plunger stem to enter at one end into the bore 49 formed in the insulating member 22 where the spring engages the end of the metal bushing 50, and the other end of the spring engages a shoulder formed on the plunger stem to urge the plunger outwardly and cause the diamond-shaped projection 59 to firmly engage the slit portion of the contact member 42. The spring 62 also serves to establish an electrical connection between the plunger stem 55 and the metal bushing 50, which latter is provided with the terminal screw 53. The depression of the button 58 by the finger will move the contact projection 59 within the channel 60 against the action of the coiled spring 62 and effect the engagement of the contact projection with 'the slit portions of the contact member 37.

In assembling the push-button, the metal bushing 50 is pressed into the bore 49 of the insulating member 22 and is equipped with the terminal screw 53. As an alternative, the bushing may obviously be molded in place in the insulating member. The bolts 34 and 35 are then inserted into their respective openings in the insulating member with the fiat elongated heads of these bolts lying in the channels 33 in the flange 26. It is obvious, however, that as an alternative, these bolts may be molded directly into the insulating member. rllhe apertured contact member 37 is then passed over the threaded ends of the bolts 34 and 35, and the nut 38 is threaded onto the bolt 34 to hold this contact member in place. The insulating member 39 is then mounted in place on the bolts 34 and 35 to engage the contact member 37, and the insulating sleeve 30 is fitted over the insulating member 22. The coiled spring 62 is then inserted into the bore 49 of the insulating member and the reduced shank 54 of the plunger stem is passed through the spring to enter the bore 52 in the bushing 50, the contact projection 59 on the plunger stem simultaneously entering the channel 60 in the insulating member 39. The contact member 42 is then passed over the bolts 34 and 35, and the nuts 43 and 44 are threaded onto the bolts to effect the engagement of the contact member with the insulating member 39 against the action of the coiled spring 62. The spring 62 is thereby placed under compression for normally retaining the contact i projection 59 againstthe contact member 42.

The resultant assembly is then introduced into the tubular casing 15 from the rear end thereof and the screws 25 are mounted in place to secure the insulating member 22 within the casing.

1n the schematic wiring diagram of Fig. 13, a battery or other source of current `connected by a conductor 76 to the metal bushing 50 receiving the plunger stem 55 of the push button, the conductor 76 also forming a common return for the lamps 2O in the push-button holder. The other terminal of the battery 75 is connected by a conductor 77 leading to one terminal of an electrical motor 78 which drives a rotary annunciator drum switch 79, and the other terminal of the motor 78 is connected by a conductor 8O leading to that bolt on the push-button which is electrically connected to the contact member 37.

The depression of the push-button by the patient effects the engagement of the contact 59 of the plunger stem 55 with the contact member 37 and serves to establish a motor circuit as follows From one terminal of the battery 7 5, through the conductor 77 electric motor 78, conductor 80, `contact member 37 in the push-button, plunger' Contact 55, conductor 76 and back to the battery, thus operating the motor 78 to revolve the rotor of the annunciator drum switch 79.

The rotor of the drum switch includes contact ribs 81 which engage with contactors 82 d uring the rotation of the rotor to establish indicating circuits as hereinafter described. A conductor 83 connects one terminal of the battery 75 with one of the contactors 82, and others of the contactors are connected by conductors 84 leading to indicating lamps 85, 86

and 87 placed in various parts of the building, one of these lamps being placed at the annunciator and another being placed near the bedside of the patient using the push-button holder. These lamps are connected in common with a conductor 84 connected to the contact member 42 of the push-button. The remaining contactors 82 are arranged in pairs, one of each pair being connected by a conductor 88 leading to a respective lamp 2O in the push-button holder 18, and the other of each pair being connected by a conductor 89 leading to a corresponding lamp 90 in an indicator 91. The indicator 91 is placed above the door 92 of the room occupied by the patient to be visible along the corridor on which the door opens. The lamps 90 in the overdoor indicator are connected by a common conductor 93 which leads to that bolt of the push-button holder to which the contact member 42 is connected.

The motor 7 8 will continue to rotate as long as the push-button is held depressed by the patient, and in its rotation, the annunciator drum switch 79 is revolved, preferably in an intermittent manner, to successive switching positions. 1n these switching positions successive circuits are established including the conductors 88 and indicating lamps 2O in the push-button holder 18, causing the diilerent lamps 2O to be successively illuminated, and preferably in an order in Which a Nurse indication is given alternately with every other indication. The successive illumination of the lamps 2O in the push-button holder indicates to the patient the corresponding switching position of the annunciator drum switch, and when the desired switching position is reached, the push-button is released Which stops the motor 78 and causes the drum switch to remain in its selected switching position. The release of the push-button ettects the engagement of the plunger stein 55 with the contact member 42, thus establishing a circuit including the battery 75, conductors 77 and 83, connected contacter 82, contact ribs 81, others of the contactors 82 connected to the conductors 84, through these conductors and the lainps 85, 8G and 87, conductor 841- and connected contact member 42 in the push-button, plunger 55, and conductor 76 back to the battery. Lamps 85, 86 and 8'? will then become illuminated, one of these lamps being at the annunciator and another being in the same room With the push-button holder. At the same time another circuit will be established including that contacter 82 which is one ot the pair of contactors connected to the active conductor 88, through the conductor 89, lamp 90 in the over-door indicator effecting the same indication as that present in the push-button holder, conductor 93, contact member 4t2 in the push-button, plunger 55, and conductor 7G back to the battery, thus illuminating that lamp 9G in the over-door indicator Which corresponds to the lighted lamp 2O in the push-button holder. The nurse on duty in the corridor Will observe the hted indicating lamp 90 in the over-doei nxlicator and thereupon attend to the Wants ot the patient. lVhen the nurse responds to the signal she depresses another push-button 9-1 placed in the room near the patients bedside, Which operation serves to momentarily establish a motor circuit causing the motor 78 to operate and return the annunciator drum switch to its succeeding blank position, Where no indicating circuits are closed.

By reason of the back contact L12 in the push-button, it Will be seen that all lamp circuits including those in the over-door indicator, and excepting only those including the lamps 20 in the push-button holder, are broken as long as the push-button is held depressed, so that all indicating lamps With the exception of those in the push-button holder Will remain dark until the patient releases the push-button upon the arrival of the desired signal in the succession. 1n this Way, unnecessary and undesirable flashing of light in the corridor, on the annunciator board and elsewhere, will be avoided.

1n the niodilied iorm of push-button shown in Figs. 5 to 8 inclusive, a flanged cylindrical casing 115 is generally similar to the casing 15 of the F 1 device and includes key-projections corresponding in iunction to the projections 28 on the insulating member 22 ot the Fig. 1 device. An insulating member 122, generally similar to the insulating member 22 oi" the Fig. 1 device, is introduced into the casing 115 and is secured therein in a similar manner. An insulating sleeve 130, similar to the insulating sleeve 80, of the Fig. 1 device, is interposed between the insulating member and the casing. The portion of the insulating member' 122 projecting into the casing includes an oll'set portion which divided centrally by a radially-extending slot 181. A pair oi" spaced parallel bolts 13stV and generally similar in character and ydisjnisition to tue bolts Ji-:l and ot the Fig. 1 device, extend through the insulating member on opposite sides ot the slot 131 and incluoe head portions 131 and 185, respectively, which .lit Within recesses in the insulating member. Terminal screws 14T and 148 are threaded axially into these bolt heads. The upper threaded portions ot the bolts 134s and 135 pass through contact members 137 und 142 and an interposed insulating member 139. 'lhese latter parts are generally similar to the parts Si', and 39 or the Fig. l device. and are assembled on the bolts 18st and 135 in a substantially identical manner.

A bore 152, corresjmnding in function and position to the bore 52 of the 1 device, is formed in the insulating member 122 and slidably receives therein the reduced cylindrical end portion ot a plunger stem 155 which is substantially identical in construction and disposition with the plunger' stem 55 oit' the Fig. 1 device. The plunger stem 155 has secured thereto a circular button 158 which may be identical in character and disposition with the button ot the Fig. 1 device.

The plunger' stein 15; is provided With a contact projection 159 of diamond-shaped cross-section extending into a channel or slot 160 iormed in the insulating member 189 to be placed in alternative engagement with the contact members 187 and 142 in a relation similar to that in the Fig. 1 device.

A coiled spring 102 similar in lunction to the coiled spring 62 ot the F 1 device surrounds the reduced portion of the plunger stem and includes a part extending into the slot 181 Where it is secured to the 'threaded end portion ot a bolt 150 which extends through the insulating member 122 near the outer edge thereol in parallel relation to the axis ot the insulating member. rllhe outer end of the insulating bolt .150 exten ds through a boss 127 projecting from the end of the insulating member to provide ample separation between the head of the bolt 150 and the tei'- minal screws 147 and 148 ot the bolts 134 and 135. The head ot the bolt 150 is disposed within a. recess in the end vofthe boss 127 and is provided with a termina-l screw 153.

In assembling the push-button, the se- Iquence oi' operation is generally the same as that employed inthe assembly ot the pushbutton of Fig. 1. The bolts 134, 135 and 150 may either be introduced through bores in the insulating member 122 or they may be molded directly into the insulating` member.

In the modiiied 'form ot push-button shown in Figs. 9 to 12 inclusive, the numeral 215 designates a cylindrical tubular metal casing generally similar to the casing 15 ot the Fig. 1 device, secured within the bore 16 .in the pear-shaped end ot the push-button holder in any suitable manner. A U-sliaped insulating member 239 generally similar to the insulating member 39 of' the Fig. 1 device is secured within the casing 215 at an intermediate por- 'tion ther-cot by means oi screws 245. The contact men'iber 242 is secured to the upper 'lace ot this insulating member by means ot a screw 235 and is hel-d in its proper position means ot' lugs 244 entering recesses in the insulating member'.

An insulating member 222, generally similar to the insulating member 22 ot the Fig. 1 device, tits within the cylindrical casing 215 and is held therein by means ot screwsY 225. A contact member 237 is secured to the upper tace ot the insulating member 222 by means ot a screw 234, and a notch 231 is formed in the upper f e ot the insulating` member to provide clearance for portions of the contact member 237. The Contact members 237 and 242 are slit a manner similar to the Contact members' 37. and `42 ot the Fig. 1 device to provide IV -shaped contact surfaces.

guide opening 252, corresponding in `tunctionA 'and position to the bore 52 of the Fig. 1 device, is formed inthe insulating member 222 and slidably receives therein the reduced end portion ot a plunger stem 255 which is generally similar' in construction and disposition to the plunger stem 550i1 the Fig. 1 device. The plunger stem 255 has secured thereto a circular button 258 which may be identical in character and disposition to the button 58 in the Fig. 1 device.

The plunger stem 255 is provided with a contact projection 259 of diamond-shaped cross-sccti on extending into a channel or slot 26() formed in the insulating member 239 to be placed in alternative engagement with the contact members 237 and 242 in a relation similar to that in the Fig. 1 device.

A coiled spring 262 similar in function to the coiled spring 62 ot the Fig. 1 device snrrounds the reduced portion ot the plunger stem and includes a part extending through the insulating member 222 and secured to a terminal screw .253 threaded into the insulatinjg member. rPhe spring thus serves to establish an electrical connection between the plunger stem and this terminal screw. The Contact portion 259 of the plunger stem is urged by the spring into engagement with the contact member 242 and the depression of the button 258 by the iinger will move the Contact projection 259 against the action of a spring to effect the engagement ot the contact projection with the contact member 237.

The insulating member 222 is provided with a flange 226 at its inner or lower end eX- tending substantially diametrically ot the nsulating member. ril,`e| 1ninal screws 247 and 243 are threaded into opposite sides of the 'flange 226 and are connected respectively with the Contact members 242 and 237 by means ot conductors 238 and 243.

In assembling the push-button ot Fig. 9, the insulating` member with its attached Contact member 242 is secured within the casing 215 by means oit the screws 245. The plunger stem is then introduced into thecasing trom above and turned sutiiciently to permit the contact projection to pass the contact member 242 subsequent to which the contact projection 259 is introduced into the channel or slot 260. The insulating member 222 with its attached member 237 and spring 262 is then introduced into the inner end oit the casing and is secured therein by the screws 225. In this assembly operation, the coiled spring 262 is passed over the reduced end portion ot the plunger stem 255 and the spring is placed under compression to urge thel contact projection 259 in iirm engagement with the contact member 242. rlhe contactmember 237 lies in close relation to the insulating vmember 239 and is placed in proper position to be engaged by the contact projection 259 when the plunger' stem 255 is depressed. y

rlhe invention provides a push-button of simple, compact and durable construction capable ot inexpensive manufacture and wellr adapted :tor its intended purpose.

That I claim as new and desire to secure by Letters Patent is:

1. In a puslrbutton, the combination of a casing, an insulating member mounted witlr in the casing, a pair ot contacts disposed on opposite sides ot said insulating member and spaced axially within the casing, a contactor movable between said contacts into selective engagement therewith and normally spring urged into engagement with one ot said contacts, said contactor having an actuating part at one end of said casing, and a second insulating member carried at the other end ot the casing and havinga recess in which said contactor is slidably `guided.

2. In a push-button, the combination of a pair of spaced contacts insulated from each 'other9 supporting means tor said contacts including a separable insulating member interposed therebetween, attaching members for securing said contacts to said insulatingl member and respectively having electrical connections with said contacts, a contactor including a portion interposed between saidI contacts for selective engagement therewith and being normally spring-urged into engagement with one otsaid contacts, and means for movably supporting said contactor.

3. In a push-button, the combination of an insulating member, contacts disposed on opposite sides of .said insulating member in insulated relation, a second insulating member, attaching members mounted in said second insulatirm` member and passing through said contacts and the first-named interposed insulating member to secure said contacts in position and to form respective electrical connections with said contacts, and a cont-actor slidably guided in said second-named insulating member and having a portion interposed between said contacts for selective engagement therewith and being normally spring-urged into engagement with one of said contacts.

4. ln a push-button, the combination ciE a apertured insulating member, a pair of apertured cont-acts disposed on opposite sides ot said insulating member in insulated relation with the apertured portions ot said contacts and insulating' member in register, a second insulating member, a pair of attaching members mounted in said second-named insulating member to project therethrough and bavi ng their projecting portions passing through said contacts and the iirst-named interposed insulating member for holding said contacts in insulated assembled relation, and a contactor slid ably mounted in said second-named insulating member having a portion interposed between said contact members for selective engagement therewith and being normally swing-urged into engagement with one oi said Contact members.

5. In a j iush-button, the combination oit an apertured insulating member, a pair ot apertured contacts disposed on opposite sides of said insulating member in insulated relation with the apertured portions of said contacts and insulating member in register, a second insulating member, a pair of attaching members mounted in said second-named insulating member to project therefrom and having their projectin portions passing` through d contacts and the first-named interposed insulating member tor holding said contacts in insulated assembled relation, a shouldered contactor slidably mounted in said secondnamed insulator member and having a portion interposed between the contacts for selective engagement therewith, and a spring interposed between said second-named insulating member and the shouldered portion of said contactorl for normally urging said con.- tactor into engagement with the contact more remote from said second-named insulating member.

6. In a push-button, the combination, with a hollow casing, of an insulating member adapted to be introduced into said casing, a pair of insulated Contact members spaced axially within said casing, attachingr members securing said contacts to said insulating member and forming terminals therefor, a plunger movably mounted in said insulating member and spring-urged outwardly therefrom, said plunger including a laterallyprojecting contact portion interposed between said contacts tor selective engagement therewith and normally urged into engagement with one ot said contacts, an actuating member tor said plunger movable within the outer end of said casing, and terminal means for said plunger carried by said insulating member.

7. In a push-button, the combination, with supporting members, of a pair of recessed sheet metal contacts disposed in substantially parallel spaced relation and presenting aligned contact surfaces at their recessed portions, a nianually-displaceablc contactor interposed bctwerrn said contacts tor selective engagement therewith and including opposite contact edges adapted to enter said rccesscd portions. means Yfor movably supporting said contactor in its operative position, and spring means tor normally urging said contactor into engagement with one of said contacts.

8. In a push-button, the combination, with a casing, ot an insulating member projecting into said casing and having an exterior flanged portion, attaching members secured within said insulating member and including terminal portions within said flanged portion ot the insulating member and projecting portions at the opposite side of said insulating member, a pair of contacts secured in insulating spaced relation on the projecting ends of said attaching members, a manually displaceable contactor movably mounted on said insulating member and including a portion interposed between said contacts for selective engagement therewith, and spring means normally urging said contactor into engagement with one of said contacts.

9. In a push-button, the combination ot' a support, a. sheet metal contact plate mounted on said support and having a slit presenting contact surfaces therealong, and a movably mounted contactor including a portion adapted to enter said slit and engage said contact surfaces.

l0. In a push-button, the combination of a support, a resilient sheet metal. contact plate mounted von said support and having a slit forming spaced resilient lips presenting Contact surfaces therealong, and a movably mounted contactor having wedge portions adapted to enter said slit and engage said resilient lips.

11. In a push-button, the combination of an insulating member, a metal plate seeured to said insulating member and having,` a slit forming a pair of contact surfaces therealong, and a movably mounted contacter having a Wedge-shaped port-ion adapted to enter said slit and engage said contact surfaces.

l2. In a push-button, the combination of an insulating member having opposite Jfaces and a recess extending between said faces, contaet plates mounted on the opposite 'faces of said insulating member and presenting Contact portions in alignment With said recess, and a movably mounted eontactor disposed Within said recess and selectively engageable With the Contact surfaces atthe opposite ends of said recess.

ln testimony whereof, I ailix my signature.

BORNETT L. BOBROFF.

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